1,Measurement Principle
Principle:
High-frequency microwave pulses issued by the guided wave radar propagate along detection components (steel cable or steel rod), met the media to be measured, since the dielectric constant of the mutation, cause reflections, a portion of the pulse energy is reflected back. Transmit pulse and the reflected pulse is proportional to the distance and the time interval measured media.
Features:
As a result of advanced microprocessor and unique choDiscovery echo processing technology, guided wave radar level meter can be used in a variety of complex conditions.
Because of the type of process connections and detection components, making 70X Series Guided Wave Radar Level Meter is suitable for a variety of complex conditions and applications. Such as: high temperature, high pressure and low dielectric constant media.
Pulsed work, guided wave radar level instruments transmit power is very low, can be installed in a variety of metals, non-metallic container, no harm to humans and the environment.
Explanation:
Guided Wave Radar is a time travel to the principle of measuring instruments, radar run at the speed of light, the running time can be converted into a level signal by electronic components. When the pulse reaches the surface of the material, the pulse is reflected back
and is received by the receiving container inside the instrument, the distance the signal is converted to level signals.
Reflected pulse signal along the cable or rod probe type transmit to the instrument electronic circuit parts, the microprocessor processes the signal, identify the microwave pulse echo generated in the material surface. Correct identification of the echo signal are completed the implementation by the pulse software , D, the distance from the material surface and the pulse travel time T is proportional:
D=C×T/2
Where C is the speed of light
Because the empty distance E is known, the level L is:
L=E-D
By entering the empty height of E (= zero), full tank height F (= hundred) and the application to set some parameters, application parameters will automatically adapt the instrument to measure the environment, corresponding to the 4-20mA output.
Measuring range:
Explanation:
H--- Measuring range L---Empty distance
B---The top of the blind
E---The minimum distance from the probe to the tank wall
--Blind spot is the minimum distance between the top of the highest material surface materials and measurement reference point.
--The bottom of the blind refers to a distance near the very bottom of the cable can not be accurately measured.
--Between the top and bottom of the blind is blind effective measure distances.
Note:
In order to ensure the accuracy of level measurement, the material should be located between the top and bottom of the blind the blind.
2,Product Introduction
| Suitable for Medium: |
Liquid, solid powder |
| Application: |
Liquid and solid powder measure, complicated process conditions |
| Explosion-proof Grade: |
Exia IIC T6 Ga/Exd IIC T6 Gb/ N/A |
| Measuring Range: |
30m |
| Antenna: |
Single cable or single rod antenna |
| Accuracy: |
±10mm |
| Process Temperature: |
(-40~250)ºC |
| Process pressure: |
(-0.1~4)MPa |
| Signal output: |
(4~20)mA/HART/Modbus (RS-485) |
| The Scene Display: |
Four LCD/Can be programmed |
| Power Source: |
Two-wire (DC24V), Four-wire(DC24V/AC220V) |
| Shell: |
Aluminum /Plastic |
| Connection: |
Flange (optional) / Thread |
| Frequency: |
500MHz-1.8GHz |
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